c++ - ctype.h

The ctype functions isspace() and friends are unaware of whether
the compiler is set to treat chars as signed or unsigned. So things
like isspace('µ') produce random results depending on what is in
memory before the _pctype array.
Should ALL the macros in ctype.h cast to unsigned char? Curiously,
the isleadbyte() macro already does.

The ctype functions isspace() and friends are unaware of whether
the compiler is set to treat chars as signed or unsigned. So things
like isspace('ï¿½') produce random results depending on what is in
memory before the _pctype array.
Should ALL the macros in ctype.h cast to unsigned char? Curiously,
the isleadbyte() macro already does.

You should cast the argument to the macros/functions in ctype.h
to unsigned.
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